Just thought I'd share these with you. They shows the female and male anatomy in relation to the spine and coccyx. I think it demonstrates how a problem with a nearby structure might impact on coccydynia. For men, you have the addition of the prostate which is behind the bladder and in front of the rectum.
The pelvic floor muscles are like a sling. They run from your pubic bone at the front to your spine at the back. They support all the organs contained within your pelvic cavity (see also, picture below).
Female Pelvic Floor
Interestingly another theory about tailbone pain relates to 'tail between your legs' (see link below).
It suggests that when we are stressed, anxious or fearful, we tighten our vestigial 'tail' (our coccyx) as if pulling our tail between our legs. Using particular pelvic muscles in the manner described, especially if done for any length of time will cause painful, shortening and contraction of these muscles. This would tie in with the repetitive strain injury (RSI) that can cause coccydynia that I have mentioned in previous posts.
'Tail between your legs' theory
This is where a specialist physio may be able to help. If your coccydynia is related to poor posture, or RSI they may be able to teach you how to relax and retrain these muscles. They can use special techniques such as pressure point work and massage to help. This is what I have been trying. Please read the full article above for a better explanation.